(1) The regulations may declare that a liquid substance specified in the regulations is, for the purposes of this Act, deemed to be designated in Appendix II to Annex II and to be categorized in a category specified in the regulations, being Category A, B, C or D.
(2) Where, in accordance with subsection (1), the regulations declare that a liquid substance is deemed to be designated in Appendix II to Annex II and to be categorized in Category A, the regulations shall declare that, for the purposes of this Act—
(a) a residual concentration specified in the regulations shall be deemed to be the residual concentration prescribed for that substance in column III of that Appendix; and
(b) a residual concentration specified in the regulations shall be deemed to be the residual concentration prescribed for that substance in column IV of that Appendix.
(3) The regulations may declare that a liquid substance designated in Appendix II to Annex II is, for the purposes of this Act, deemed not to be so designated.
(4) The regulations may declare that a liquid substance designated in Appendix II to Annex II and categorized in a particular category is, for the purposes of this Act, deemed not to be so categorized but to be categorized in a category specified in the regulations.